package com.itheima.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;

/**
Druid连接池的工具类
 */
public class JDBCUtils {
    //定义成员变量 DataSource
    private static DataSource ds;

    static {

        try {
            //1.加载配置文件
            Properties pro = new Properties();
            pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
            //2.获取DataSource
            ds= DruidDataSourceFactory.createDataSource(pro);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //3.获取连接方法
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    //4.释放资源
    public static void close(PreparedStatement ps, Connection conn){
        close(null,ps,conn);
    }
    public static void close(ResultSet rs, PreparedStatement ps, Connection conn){
        if(rs!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(ps!=null){
            try {
                ps.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(conn!=null){
            try {
                conn.close();//归还连接
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    //5.获取连接池方法
    public static DataSource getDataSource(){
        return ds;
    }



}
